jQuery makes it effortless to make additional data available from within the jQuery.ajax callbacks (success | error | complete) because within the callbacks, this refers to the object that was passed to jQuery.ajax. Knowing this, you can provide extra parameters that jQuery.ajax will ignore but you can access later. For example:

$.ajax({
	url: ‘/‘,
	pudding: ‘chocolate’,
	success: function() {
		alert(this.pudding); //alerts chocolate
	}
});